//  This file is part of YamlDotNet - A .NET library for YAML.
//  Copyright (c) Antoine Aubry and contributors

//  Permission is hereby granted, free of charge, to any person obtaining a copy of
//  this software and associated documentation files (the "Software"), to deal in
//  the Software without restriction, including without limitation the rights to
//  use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
//  of the Software, and to permit persons to whom the Software is furnished to do
//  so, subject to the following conditions:

//  The above copyright notice and this permission notice shall be included in all
//  copies or substantial portions of the Software.

//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
//  SOFTWARE.

using System;
using System.Collections.Generic;

namespace YamlDotNet.Serialization.ObjectFactories
{
    /// <summary>
    /// Creates objects using Activator.CreateInstance.
    /// </summary>
    public sealed class DefaultObjectFactory : IObjectFactory
    {
        private static readonly Dictionary<Type, Type> defaultInterfaceImplementations = new Dictionary<Type, Type>
        {
            { typeof(IEnumerable<>), typeof(List<>) },
            { typeof(ICollection<>), typeof(List<>) },
            { typeof(IList<>), typeof(List<>) },
            { typeof(IDictionary<,>), typeof(Dictionary<,>) }
        };

        public object Create(Type type)
        {
            if (type.IsInterface())
            {
                Type implementationType;
                if (defaultInterfaceImplementations.TryGetValue(type.GetGenericTypeDefinition(), out implementationType))
                {
                    type = implementationType.MakeGenericType(type.GetGenericArguments());
                }
            }

            try
            {
                return Activator.CreateInstance(type);
            }
            catch (Exception err)
            {
                var message = string.Format("Failed to create an instance of type '{0}'.", type);
                throw new InvalidOperationException(message, err);
            }
        }
    }
}